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本帖最后由 chinatown 于 2017-1-6 13:48 编辑
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8 h- b- v8 A1 z. f. p% iIEC 60216-4-1 is a standard providing requirements for ovens for aging tests and requires forced gas% x. x/ M+ s& [, O5 ^/ |
ventilation. As the ball pressure test is not considered to be an ageing test such forced gas ventilation5 k' _+ U$ ?) I, ?5 Z6 N6 w
is not required and should not be confused with forced convection.2 Z: Y& u8 K \ d6 e
For the purpose of ball pressure testing chambers with or without forced convection may be used,: z# `9 N/ G* D
provided all other requirements are fulfilled.
4 @+ D' }) ?! P' u) I- SFollowing clause 5.2 of the standard and considering the note there, a separate thermocouple on or, o# A* ~ f f8 Q9 l! O( y* o
right below the surface of the test specimen support and as close as practical to the test sample shall
5 O4 G8 F( E' y( ybe used to check that the temperature of the test specimen support does not significantly deviate from) T8 l6 Q; V7 U% f7 t: U
the test temperature.
7 f v) L, ] jIn addition measure the air temperature as close as possible to the test specimen.
2 [* G, e% ]) JIn case of non-round indentation obtained, report the biggest diameter measurement observed. The5 \2 a- d- d1 R! i3 U
maximum difference between the longest and shortest measurement should not exceed 0,2 mm.4 I7 S7 a* l* X4 ~0 m. @
Where the product standard contains differing or conflicting requirements to IEC 60695-10-2 or to this
( ]6 B4 j3 Z7 Q5 Cdecision sheet these product standard requirements override the requirements from IEC 60695-10-26 X, v& Y& S6 w" ?$ O" ~( h
and this decision sheet.1 F/ [8 a% b* B8 z% P8 x
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